304 TABULATE CORALS. 



Sub-genus Fistulipora, M'Coy, 1849. 



(Ann. and Mag. Nat. Hist, ser. 2, vol. iii. p. 130.) 



Callopora, Hall. Pal. N.Y., vol. ii. p. 144. 1S52. 



The corals of this group were separated by M'Coy to form 

 his genus Fishdipora, with the following generic diagnosis : — 



" Corallum encrusting, composed of long, simple, cylindrical, 

 thick-walled tubes, the mouths of which open as simple, equal, 

 circular cells on the surface, and having transverse funnel- 

 shaped diaphragms at variable distances ; interval between 

 the tubes occupied by a cellular network of small vesicular 

 plates." The type of the genus is the F. minor, M'Coy, of 

 the Carboniferous Limestone of Derbyshire. 



At a later period, Professor Hall proposed the name of 

 Callopora for certain Upper Silurian corals, with the following 

 generic diagnosis : — 



" Ramose or encrusting species of corals, having a columnar 

 structure ; cells tubular, with the apertures circular or petaloid, 

 not contiguous, and having the intermediate spaces occupied 

 by angular cell-like openings which are transversely septate ; 

 tubular cells rarely septate." 



The identity of Fishdipora, M'Coy, and CaUopoj^a, Hall, 

 has long been more than suspected, the chief difficulty in the 

 way of uniting the two being that M'Coy states that the tabulae 

 in the large corallites of Fisttdipora have infundibuliform 

 tabulae, while Hall describes radiating septa as sometimes 

 present in the type-species of Callopora. M 'Coy's statement 

 as to the tabulee is, however, clearly based upon imperfect 

 observation, and this is also almost certainly the case as to the 

 alleged occurrence of septa. At any rate, having carefully 

 examined specimens of F. minor, M'Coy, the type of the genus 

 Fistulipora, and having compared these with typical examples 

 of Hall's genus Callopora from the Silurian and Devonian 

 rocks of North America, I am satisfied that the two are un- 



